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# 9K speeding up

### 9K speeding up AJHS nz

QuestionAnswer
mean speed The total distance something travels divided by the total time taken allows you to calculate the thing’s mean or average speed.
speed How fast something is moving. Often measured in metres per second (m/s), miles per hour (mph) or kilometres per hour (km/h).
accelerate Change speed.
air resistance A force that tries to slow down things that are moving through the air. It is a type of friction.
balanced forces When two forces are the same strength, but working in opposite directions.
friction A force that tries to slow things down when two things rub against each other.
unbalanced forces When two forces working in opposite directions are not the same strength.
drag Another name for air resistance or water resistance.
streamlined Giving something a smooth shape to reduce the air resistance or water resistance.
water resistance A force that tries to slow down things that are moving through water. It is a type of friction.
distance–time graph A graph that shows how far something has moved in a certain time.
terminal velocity The maximum speed of an object. Usually only applies to falling objects when the downward force is balanced by drag.
Created by: johncl
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